56863...18433 (54-digits)

This number is a prime.

5686 3064753535 6955169033 4109408678 0483936074 2060818433

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The largest known factor of the smallest Fermat number which has not been fully factorized as of March 2026 (F_12). Discovered in 2010 by Vang, Zimmerman and Krappe. [Reamy]

Submitted: 2026-03-20 15:21:23; Last Modified: 2026-10-31 12:25:36.